KR20110015415A - Composite magnetic antenna and rf tag, metal part and metal instrument having the composite magnetic antenna or the rf tag - Google Patents

Abstract

The present invention relates to a composite magnetic antenna for communicating information using a magnetic field component and a composite RF tag using the same, and enables use in metal embedding, which was not available in conventional RF tags, while maintaining sufficient communication sensitivity. It is. A complex RF tag for transmitting and receiving information using an electromagnetic induction method, wherein the complex RF tag is made of a magnetic antenna mounted with an IC, an insulator formed around the magnetic antenna, a metal or a conductive material, and the magnetic antenna is The electrode material is formed to have a coil shape around the core made of a magnetic material, and the insulator is formed around one end of the coil antenna in the magnetic length direction, and the metal or conductive material is formed outside the insulator. It is a complex RF tag.

Description

COMPONITE MAGNETIC ANTENNA AND RF TAG, METAL PART AND METAL INSTRUMENT HAVING THE COMPOSITE MAGNETIC ANTENNA OR THE RF TAG}

The present invention relates to a magnetic antenna for communicating information using a magnetic field component and an RF tag using the magnetic antenna, wherein the magnetic antenna is surrounded by a metal or conductive material except one end of the coil length direction. In this case, it is possible to use the metal buried that was not available in the conventional RF tag while maintaining sufficient communication sensitivity.

An antenna that transmits and receives electromagnetic waves using a magnetic material (hereinafter, referred to as a "magnetic antenna") forms a coil by winding a conductor on a core (magnetic material), and induces a magnetic component from the outside to penetrate the magnetic material. As an antenna which converts into a voltage (or current), it has been widely used in small radios and TVs. Moreover, it is used for the non-contact object identification apparatus called RF tag which has spread | distributed in recent years.

If the frequency is higher, the RF tag uses a planar loop coil whose antenna is parallel to the object to be identified without using a magnetic material, and when the frequency is increased (UHF band or microwave band), the magnetic field component including the RF tag is used. Rather than detecting, electric field antennas (dipole antennas and dielectric antennas) for detecting electric field components are widely used.

When such a planar loop antenna or an electric field antenna approaches a metal object, an image (mirror effect) is generated on the metal object, and thus is out of phase with the antenna, thereby causing a problem that the sensitivity of the antenna is lost.

On the other hand, as a magnetic antenna for transmitting and receiving magnetic components, an electrode material is formed in a coil shape on a core centered on a magnetic layer, and an insulating layer is formed on one or both outer surfaces of the coiled electrode material, and the insulation A magnetic antenna having a conductive layer provided on one or both outer surfaces of the layer is known (Patent Document 1). The magnetic antenna maintains its characteristics as an antenna even when it is in contact with a metallic object. Moreover, the tag or antenna which specified the installation state of a tag or magnetic body antenna is known (patent documents 2-4).

Japanese Patent Publication No. 2007-19891 Japanese Patent Laid-Open No. 2002-207980 Japanese Patent Laid-Open No. 2004-362342 Japanese Patent Laid-Open No. 2005-198255

In the method of the said patent document 1, although the countermeasure to the metal pasting use in a specific direction is considered, when it is embedded in a metal component, a metal tool, etc., sufficient sensitivity cannot be maintained.

Moreover, in the method of the said patent document 2, it aims at installing on the surface of a target object, and embedding in a target object and using it is not considered.

In addition, although the method described in the said patent documents 3 and 4 describes covering the periphery of a magnetic antenna with a magnetic body, it aims at improving a sensitivity by coating a ferrite material, and influences the influence of the metal or conductor of an outer periphery. It is not something that can be solved.

Accordingly, an object of the present invention is to obtain a composite RF tag or a composite magnetic antenna including a magnetic antenna capable of maintaining characteristics even in a state of being embedded in a small diameter hole formed in a metal.

The technical problem can be achieved by the present invention as follows.

That is, the present invention is a composite RF tag for transmitting and receiving information using an electromagnetic induction method, the composite RF tag is composed of a magnetic antenna mounted with an IC and the insulator and metal or conductive material formed around the magnetic antenna The magnetic antenna is formed such that the electrode material is coiled around a core made of magnetic material, and the insulator is formed around one end of the magnetic antenna in the longitudinal direction of the coil, and the metal or conductive material is It is a composite RF tag formed on the outer side of an insulator (Invention 1).

In addition, the present invention is a composite RF tag for transmitting and receiving information using an electromagnetic induction method, the composite RF tag is composed of a magnetic antenna mounted with an IC and the insulator and metal or conductive material formed around the magnetic antenna The magnetic antenna is formed such that an electrode material is coiled around a core made of a magnetic material and a nonmagnetic material, and the insulator is formed around one end of the coil antenna in a magnetic length direction of the magnetic material. Water is a composite RF tag formed on the outside of the insulator (Invention 2).

In addition, in the composite RF tag according to the present invention 1, when the shape of the metal material or the conductive material is circular, the internal diameter of the metal material or the conductive material is 1.0 times or more the longest length of the cross section of the magnetic antenna ( Invention 3).

In addition, in the composite RF tag according to the present invention 1, the length of the metal or conductive material in the depth direction is 1.0 times or more of the length in the longitudinal direction of the magnetic antenna (Invention 4).

In addition, the present invention is a composite magnetic antenna for transmitting and receiving information using an electromagnetic induction method, wherein the composite magnetic antenna is made of a magnetic antenna and an insulator formed around the magnetic antenna and a metal or conductive material, the magnetic antenna Is formed such that the electrode material is coiled around a core made of a magnetic body or a magnetic body and a non-magnetic body, and the insulator is formed around one end of the coil antenna in the magnetic length direction of the magnetic antenna. A magnetic antenna is formed outside the insulator (invention 5).

Moreover, this invention is a metal component provided with the composite RF tag in any one of this invention 1-4, or the composite magnetic antenna of this invention 5 (this invention 6).

Moreover, this invention is a metal tool provided with the composite RF tag in any one of this invention 1-4, or the composite magnetic antenna of this invention 5 (this invention 7).

The composite RF tag and the composite magnetic antenna according to the present invention are suitable for 13.56 MHz RFID (Radio Frequency Identification) use because there is no variation in communication sensitivity even when embedded in a hole of a small space of a metal.

Since the composite RF tag and the composite magnetic antenna according to the present invention are compact and can ignore external influences, in particular, the influence of external metals or conductors, portable devices, containers, metal parts, substrates, metal tools, various molds, printing plates, etc. And embedded in various applications such as printing rolls, vehicles such as bicycles and automobiles, markers such as metal jigs, bolts, and tacks.

1 is a conceptual diagram of a complex RF tag according to the present invention.
2 is a cross-sectional view of a composite RF tag in accordance with the present invention.
3 is a conceptual diagram of a magnetic antenna in the present invention.
4 is a conceptual diagram of a magnetic antenna in the present invention.
5 is a conceptual diagram of a magnetic antenna in the present invention.
6 is a laminated configuration diagram of coil portions of the magnetic antenna of the present invention.
[Description of the code]
1: through hole
2: electrode layer (coil electrode)
3: coil open end face
4: coil
5: magnetic layer
6: insulation layer
7: conductive layer
8: nonmagnetic layer
17: magnetic antenna
20: Insulation
30: metal or conductive material
a: longest diameter of the magnetic antenna
b: inner diameter of metal or conductive material
c: length of the magnetic antenna in the longitudinal direction
d: length in the depth direction of the metal or the conductive material

First, the composite RF tag according to the present invention is described.

In the composite RF tag according to the present invention, an insulator is formed around one end of the coil length direction (opening surface of the magnetic flux) of a magnetic antenna (RF tag) in which an IC is mounted, and a metal or a conductive material is formed of the insulator. It is formed on the outside. The magnetic antenna is formed so that the electrode material is coiled around a core made of a magnetic body or a magnetic body and a non-magnetic body. An IC is mounted on the magnetic antenna to form an RF tag.

A schematic diagram of a composite RF tag according to the present invention is shown in FIGS. 1A to 1D and FIG. 2.

As shown in the figure, the composite RF tag according to the present invention is disposed around the magnetic antenna 17 so as to surround one end of the coil in the longitudinal direction with a metal or conductive material 30, and the magnetic antenna and the It has a structure filled with the insulating material 20 between metal and a conductive material.

In the present invention, the cross-sectional shape of the metal or the conductive material is not particularly limited, and may be any shape such as a polygonal shape such as a circle, an ellipse, a triangle, a rectangle, a pentagon, a hexagon, or a star. In view of industrial productivity, the prototype is preferable.

In addition, in the metal material or the conductive material, the cross-sectional shape of the magnetic antenna in the longitudinal direction of the coil has no bottom as shown in FIGS. 1B to 1D in addition to the cylindrical shape shown in FIG. It may be hemispherical, conical or bottom-spherical.

The metal or the conductive material need not be formed on the entire outer surface of the insulator, but may be in a state formed on the entire outer surface of the insulator or in a gap formed state. For example, a state in which two or more curved metals or conductive materials are formed with a gap such that the metals or conductive materials do not come into contact with each other, and two or more plate-shaped metals or conductive materials are formed in the metal materials or conductive materials. Formed on the insulator so that water does not come into contact, partially formed gaps, in the case where the cross-section of the insulator is circular, in which the metal or conductive material is formed in a C-shape, and the cross-section of the insulator is formed in a rectangular shape In the case of a shape, any state such as a state in which a metal material or a conductive material is formed in each portion may be used. Further, even in the state where the gap is formed, only the end portion of at least one end of the composite RF tag may be in a state in which a metal material or a conductive material is formed on the entire surface.

In the present invention, when the shape of the metal material or the conductive material is circular, the inner diameter of the metal material or the conductive material (c in FIG. 2) has a ratio (c / a) to the longest length of the cross section of the magnetic antenna (a in FIG. 2). It needs to be 1.0 times or more, but 1.1 times or more is preferable. More preferably, it is 1.3 times or more.

In addition, it is preferable that ratio (d / b) with respect to the length (d of FIG. 2) of the core of the length (d of FIG. 2) of the depth of a metal or a conductive material is 1.0 times or more. When said d / b is less than 1.0, it becomes difficult to have sufficient sensitivity. More preferably, it is 1.2 times or more.

The thickness of the metal or the conductive material is not particularly limited, but is preferably about 0.5 to 2.0 mm.

Although it does not specifically limit as a metal substance in this invention, Stainless steel, iron, aluminum, copper, brass, etc. which are pipe materials of general metals are mentioned. As the conductive material, carbon or the like can be used a conductive material, a conductive polymer material such as polyacetylene, or a composite thereof.

As an insulator in this invention, resin, glass ceramics, nonmagnetic ferrite, etc. may be used. As resin, what has heat resistance, such as a polyimide, an epoxy resin, and a phenol resin, is preferable. As glass ceramics, borosilicate type glass, zinc type glass, lead type glass, etc. are preferable. As nonmagnetic ferrite, Zn type ferrite etc. are preferable. Moreover, you may mix and use 2 or more types of resin, glass ceramic, and nonmagnetic ferrite.

In the present invention, an IC is mounted on a magnetic antenna to be used as an RF tag. On the other hand, even when the IC is not mounted, it can be used as an antenna. Further, with respect to the composite magnetic antenna, the wiring connected to the coil lead terminal of the magnetic antenna can be extended to the outside of the composite magnetic antenna to be connected with an IC chip provided outside the composite magnetic antenna.

Next, the magnetic antenna in the present invention is described.

3 to 5 schematically show the magnetic antenna of the present invention.

The magnetic antenna shown in Fig. 3 is formed such that the electrode material is coiled (wound) around a magnetic layer (core), and an insulating layer is formed on one or both outer surfaces of the coiled electrode material. It is a basic structure.

In the present invention, the magnetic antenna shown in Fig. 3 forms a magnetic layer 5 in which a single layer or a plurality of layers in which a mixture of magnetic powder is mixed with a binder is stacked, as shown in Fig. 6, The through hole 1 is formed in the magnetic layer 5. The electrode layer 2 is formed so that the electrode material flows into each of the through holes 1 and is perpendicular to the through holes 1 so as to be connected to the through holes 1 so as to be coiled (wound). The coil is formed so that the magnetic layer 5 becomes a square or rectangular core. At this time, both ends of the magnetic layer 5 forming the coil 4 are opened on the magnetic circuit.

Next, the insulating layer 6 is formed in the upper and lower surfaces of the coil 4 in which the electrode layer was formed.

The obtained sheet can be produced by cutting at the through hole 1 and the coil open end face 3 so as to have a desired shape, or by integrally firing, or after cutting at the through hole 1 and coil open end face 3 after integral firing. (LTCC technology).

The magnetic antenna shown in Fig. 4 is formed such that the electrode material is coiled (wound) around a magnetic layer (core), and an insulator is formed on one or both outer surfaces of the coiled electrode material. It is a basic structure that a conductive layer is provided on one or both outer surfaces of an insulator.

In the present invention, the magnetic antenna shown in Fig. 4 forms a magnetic layer 5 in which a single layer or a plurality of layers in which a mixture of magnetic powder is mixed with a binder is stacked, as shown in Fig. 6, The through hole 1 is formed in the magnetic layer 5. An electrode material 2 is introduced into each of the through holes 1 and connected to the through holes 1 on both sides perpendicular to the through holes 1 so as to form a coil shape (a wound shape). The coil is formed so that the magnetic layer 5 becomes a square or rectangular core. At this time, both ends of the magnetic layer 5 forming the coil 4 are opened on the magnetic circuit.

Next, the insulating layer 6 is formed in the upper and lower surfaces of the coil 4 in which the electrode layer was formed.

In addition, the conductive layer 7 is formed on the upper surface (outer surface) of one or both of the insulating layers 6.

The sheet thus obtained can be produced by cutting the through-hole 1 and the coil-opening end face 3 so as to have a desired shape, or by integrally firing, or by cutting the through-hole 1 and the coil-opening end face 3 after the integral firing. (LTCC technology).

In the magnetic antenna shown in Fig. 5, the magnetic antenna according to the present invention is formed such that the electrode material is coiled (wound) on the outer side of the core with the core made of the magnetic body 5 and the nonmagnetic body 8 as the center. The basic structure is to form an insulating layer on one or both outer surfaces of the coil-shaped electrode material. The core has a structure in which magnetic materials are divided into nonmagnetic materials.

In the magnetic antenna shown in Fig. 5, in the cross section of the core, the ratio (total magnetic material / total nonmagnetic material) of the area between the total magnetic material and the total nonmagnetic material is preferably 1.0 or less. When the nonmagnetic layer is larger than the above range, the proportion of the magnetic material in the core is lowered, which is disadvantageous for miniaturization of the magnetic antenna. More preferably, it is 0.5 or less, More preferably, it is 0.2 or less.

In the magnetic antenna shown in Fig. 5, the ratio S / L of one cross-sectional area S of the magnetic layer forming the core of the magnetic antenna shown in Fig. 5 to the length L of the magnetic antenna is 0.3 or less. Is preferred. When the area ratio S / L exceeds 0.3, it becomes difficult to reduce the influence of the diamagnetic field.

In the present invention, the magnetic antenna having the core shown in FIG. 5 can be manufactured by, for example, the following method.

First, a magnetic layer in which a single layer or a plurality of layers in which a mixture of magnetic powder and a binder is mixed in a sheet form is laminated is formed.

Separately, the nonmagnetic layer which laminated | stacked the single layer which laminated | stacked the sheet | seat which mixed the nonmagnetic powder and binder in the form of sheets, or several layers is formed.

Next, as shown in Fig. 6, the magnetic layers 5 and the nonmagnetic layers 8 are alternately stacked so that the entire thickness becomes the desired thickness.

Next, the desired number of through holes 1 is formed in the laminated magnetic layer and the nonmagnetic layer. An electrode material is introduced into each of the through holes. Further, the electrode layer 2 is formed on both surfaces perpendicular to the through hole so as to be connected to the through hole so as to be coiled (wound). By the electrode material and the electrode layer which flowed into the through-hole, a coil is formed so that a magnetic layer may become a rectangular core. At this time, both ends of the magnetic layer forming the coil are open on the magnetic circuit (3 in Fig. 6).

Next, as shown in FIG. 5, the insulating layer 6 is formed in the upper and lower surfaces of the coil in which the electrode layer was formed.

The obtained sheet can be manufactured by cutting at the through-hole and the coil-opening end face so as to have a desired shape, or by integrally baking or cutting at the through-hole and the coil-opening end face after the single-firing (LTCC technique).

In the magnetic antenna of the present invention, Ni-Zn-based ferrite or the like can be used for the magnetic material of the core. In the case of using the Ni-Zn ferrite, Fe ₂ O ₃ 45 to 49.5 mol%, NiO 9.0 to 45.0 mol%, ZnO 0.5 to 35.0 mol%, CuO 4.5 to 15.0 mol% of the frequency band to the composition is preferable, and use The ferrite composition may be selected in which the magnetic permeability is high and the magnetic loss is low. A material with a higher permeability than necessary increases the magnetic loss, making it unsuitable for antennas.

For example, a ferrite composition having a magnetic permeability of 70 to 120 at 13.56 MHz and a magnetic permeability of 10 to 30 at 100 MHz is preferable for RFID tag applications because of low magnetic losses.

In the magnetic antenna of the present invention, a coil lead terminal and an IC chip connection terminal are formed of an electrode material on the outer surface of the insulating layer to connect the IC.

The magnetic antenna on which the IC chip connection terminal is formed forms a through hole (1) in the insulating layer (6) of at least one side of the coil (4) on which the electrode layer is formed, and introduces electrode material into the through hole (1). The coil lead terminal and the IC chip connection terminal are formed by electrode material on the surface of the said insulating layer, and it can obtain by integrally baking.

In the magnetic antenna of the present invention, a capacitor electrode may be disposed on the outer side of the insulating layer, and an insulating layer may be further provided on the outer side of the capacitor electrode.

In addition, the magnetic antenna of the present invention may form a capacitor by printing a parallel electrode or a comb-shaped electrode on the outer surface of the insulating layer, and may be connected in parallel or in series with the coil lead terminal.

In addition, the magnetic antenna according to the present invention further includes an insulating layer on the outer side of the capacitor electrode, forms an electrode serving as an IC chip connection terminal on the outer side of the insulating layer, and sandwiches the capacitor. It may be formed and connected in parallel or in series with the IC chip connection terminal.

In addition, the magnetic antenna of the present invention has a terminal structure in which an IC chip can be connected to the outer surface of the insulating layer, and the IC chip connection terminal and the coil lead terminal can be connected in parallel or in series.

In addition, the magnetic antenna of the present invention may form a terminal on which the variable capacitor is provided on the outer surface of the insulating layer, and may connect the coil lead terminal and the coil lead terminal in parallel or in series.

In the magnetic antenna of the present invention, Ni-Zn-based ferrite or the like can be used for the magnetic material of the core. In the case of using a Ni-Zn-based ferrite, a composition having 45 to 49.5 mol% of Fe ₂ O ₃ , 9.0 to 45.0 mol% of NiO, 0.5 to 35.0 mol% of ZnO, and 4.5 to 15.0 mol% of CuO is preferable, and at a frequency band to be used, What is necessary is just to select the ferrite composition with high permeability as a material and low magnetic loss. Too high permeability as a material increases magnetic losses, making it unsuitable for antennas.

For example, a ferrite composition having a magnetic permeability of 70 to 120 at 13.56 MHz and a magnetic permeability of 10 to 30 at 100 MHz is preferable for RFID tag applications because of low magnetic losses.

The magnetic antenna of the present invention is a nonmagnetic ferrite such as Zn-based ferrite, glass-based ceramics such as borosilicate glass, zinc-based glass or lead-based glass, or a nonmagnetic ferrite and glass-based ceramics in an appropriate amount. Can be used.

What is necessary is just to select the Zn type ferrite composition which the volume specific resistance of a sintered compact will be 10 ⁸ ohm cm or more for the ferrite powder used for a nonmagnetic ferrite. Is an Fe ₂ O ₃ 45 to 49.5 mol%, ZnO 17.0 to 22.0 mol%, CuO 4.5 to 15.0 mol% of the composition is preferred.

In the case of glass-based ceramics, the glass-based ceramic powder to be used may be selected to have a composition in which the linear expansion coefficient does not differ significantly from the linear expansion coefficient of the magnetic body used. Specifically, the difference with the linear expansion coefficient of the soft magnetic ferrite used as the magnetic substance is a composition within ± 5 ppm / 占 폚.

Next, the manufacturing method of the composite RF tag which concerns on this invention is stated.

In the composite RF tag according to the present invention, a magnetic antenna mounted with an IC fabricated by the above-described method is disposed so as to surround one end in the longitudinal direction with a conductive material or a metal material, and a void is formed by filling a void. Can be. In addition, the magnetic antenna may be coated with a resin by dipping or the like, and a metal or a conductor may be applied to the dried resin coating surface by using a paste or the like.

The composite RF tag according to the present invention can be embedded in recesses of a predetermined shape such as metal parts, metal tools, and the like. It is good to form the recessed part of predetermined shape in the target object in which the antenna or tag, such as a metal component and a metal tool, is to be installed previously.

In addition, the composite RF tag according to the present invention is preferably installed so that the longitudinal direction (open face of the magnetic flux) of the coil is perpendicular to the reader.

<Action>

The magnetic antenna according to the present invention is formed so as to surround the outer periphery with a metal material or a conductive material, so that there is no misalignment of characteristics such as resonance frequency when embedded in the metal material, and the influence of communication sensitivity due to the change of the use environment can be minimized. .

[Example]

EMBODIMENT OF THE INVENTION This invention is demonstrated in detail based on embodiment of this invention, referring an accompanying drawing below.

[RF Tag 1]

For magnetic layers, Ni-Zn-Cu ferrite calcined powder having a magnetic permeability of 100 at 13.56 MHz after sintering at 900 ° C. becomes 100 (48.5 mol% of Fe ₂ O ₃ , 25 mol% of NiO, and 16 mol% of ZnO). A slurry was prepared by mixing 100 parts by weight of CuO, 10.5 mol%), 8 parts by weight of butyral resin, 5 parts by weight of plasticizer, and 80 parts by weight of solvent with a ball mill. The resulting slurry was sheet-molded with a doctor blade so that the sides were 150 mm on the PET film and the thickness at the time of sintering was 0.1 mm.

Visa as for stratification, borosilicate glass (SiO ₂ 86 to 89 wt%, B ₂ O ₃ 7 to 10 wt%, K ₂ O 0.5 to 7% by weight) 100 parts by weight of butyral resin 8 parts by weight of plasticizer, 5 parts by weight 80 parts by weight of a solvent were mixed in a ball mill to prepare a slurry. The resultant slurry was sheet-molded on the PET film with a doctor blade so that each side was 150 mm and the thickness at the time of sintering was 0.05 mm, respectively.

Similarly, for the insulating layer, 100 parts by weight of Zn-Cu ferrite calcination powder (48.5 mol% of Fe ₂ O ₃ , 41 mol% of ZnO, 10.5 mol% of CuO), 8 parts by weight of butyral resin, 5 parts by weight of plasticizer, and 80 parts by weight of solvent The parts were mixed in a ball mill to prepare a slurry. The resulting slurry was sheet molded to the same size and thickness as the magnetic layer on the PET film with a doctor blade.

Next, as shown in Fig. 6, through holes 1 are formed in the green sheet for the magnetic layer, Ag paste is filled therein, and Ag paste is printed on both sides perpendicular to the through holes 1 and 10 Each layer was laminated to form a coil.

Next, as shown in FIG. 5, the green sheet for the insulating layer 6 is laminated on the upper and lower surfaces of the coil 4.

The laminated green sheets were joined together and pressure-bonded, cut at the through-hole and the coil open end face 3, and integrally baked at 900 ° C. for 2 hours, and a magnetic antenna having 23 turns of coil winding of 10 mm width × 3 mm length. (1) was produced. (In the drawings, the number of coil windings is simplified, and the number of stacked layers of the magnetic layer is shown in three layers for the sake of simplicity. The same applies to the other drawings below.)

In addition, an RF tag IC was connected to both ends of the coil of the magnetic antenna, and a capacitor was connected in parallel with the IC to adjust the resonant frequency to 13.56 MHz while being surrounded by a metal or conductive material to form an RF tag.

Place the obtained RF tag in a metal tube (stainless steel) with an outer diameter of 6 mm, an inner diameter of 5 mm and a length of 15 mm, align one end of the magnetic antenna with the center of the metal tube so that the center overlaps, and fill the voids with epoxy resin, It was formed by covering the lid with a metal plate (stainless steel).

At this time, the ratio (c / a) to the longest length (a in FIG. 2) of the cross section of the magnetic antenna of the inner diameter (c in FIG. 2) of the metal tube was 1.4 times, and the length (d in FIG. 2) in the depth direction of the metal tube. The ratio (d / b) with respect to the length (b of FIG. 2) of the magnetic antenna was 1.5 times.

The following measurements were carried out before and after installing the composite RF tag in a recess having an inner diameter of 6 mm and a depth of 15 mm formed in a SUS block having a height of 5 cm and each side of 5 cm.

[Measurement and Adjustment Method of Resonant Frequency]

The resonance frequency was set as the resonance frequency with the peak frequency of the impedance measured with the Agilent Technologies Impedance Analyzer 4291A.

[Measuring method of communication distance]

The communication distance is not covered with the metal or conductive material of the manufactured RF tag by the pen tip of the antenna of the pen-type reader / writer (manufactured by Takaya Co., Ltd., product name TR3-PA001 / TR3-M001B), which is less affected by external metal. The distance between the antenna and the RF tag at a position as far as possible at 13.56 MHz was set as the communication distance.

[RF Tag 2 Comparative Example]

The IC was mounted on the magnetic antenna manufactured as in Example 1 as it was, and in that state, the resonant frequency was adjusted to 13.56 MHz to obtain an RF tag. The obtained RF tag was coated and evaluated with an epoxy resin so that it could be installed in the said SUS block similarly to RF tag 1.

As shown in Table 1, in the composite RF tag not covered with the metal material, communication was not possible when embedded in the metal material.

Claims (7)

A complex RF tag for transmitting and receiving information using an electromagnetic induction method, wherein the complex RF tag includes a magnetic antenna mounted with an integrated circuit (IC) and an insulator, metal or conductive formed around the magnetic antenna. The magnetic antenna is formed of water so that the electrode material is coiled around a core made of magnetic material, and the insulator is formed around one end of the coil antenna in the magnetic length direction of the magnetic antenna. A conductive RF tag is formed on the outside of the insulator. A complex RF tag for transmitting and receiving information using an electromagnetic induction method, wherein the complex RF tag is made of a magnetic antenna mounted with an IC, an insulator formed around the magnetic antenna, a metal or a conductive material, and the magnetic antenna is The electrode material is formed to have a coil shape around a core made of a magnetic material and a nonmagnetic material, and the insulator is formed around one end of the coil antenna in the longitudinal direction of the magnetic antenna, and the metal or conductive material is formed of the insulator. Complex RF tag formed on the outside. The composite RF tag of claim 1, wherein when the metal or the conductive material has a circular shape, the inner diameter of the metal or the conductive material is 1.0 times or more of the longest length of the cross section of the magnetic antenna. The complex RF tag of claim 1, wherein a length of the metal material or the conductive material in a depth direction is 1.0 times or more of a length of the magnetic antenna. A composite magnetic antenna for transmitting and receiving information using an electromagnetic induction method, wherein the composite magnetic antenna is made of a magnetic antenna and an insulator formed around the magnetic antenna and a metal or conductive material, and the magnetic antenna is made of a magnetic body or a magnetic body. The electrode material is formed to have a coil shape around the core made of a nonmagnetic material, and the insulator is formed around one end in the coil length direction of the magnetic antenna, and the metal or the conductive material is formed on the outside of the insulator. Composite magnetic antenna formed. The metal component which provided the composite RF tag of any one of Claims 1-4, or the composite magnetic antenna of Claim 5. The metal tool which provided the composite RF tag of any one of Claims 1-4, or the composite magnetic antenna of Claim 5.

Images